Dice tower

'small tower') is a tool used by gamers to roll dice fairly.

Dice are dropped into the top of the tower, and bounce off of various hidden platforms inside it before emerging from the front.

[1] The Vettweiss-Froitzheim Dice Tower is a surviving example, used by Romans in Germany; it has essentially the same design as modern examples, with internal baffles to force the dice to rotate more randomly.

In tournament backgammon, a dice tower, often referred to as a dice tumbler, is commonly used to ensure fairness by reducing the possibility of a player's intentional influence on the roll.

In tabletop role-playing games, a dice tower may have the additional purpose of allowing the players to roll dice, while only the gamemaster can see the result of the roll.